Unit 5- The Atmosphere

Which pie chart correctly shows the percentages of elements in the air?

• 1

• 2

• 3

• 4

The most abundant gas in the atmosphere is​ (a)   . Then ​ ​ (b)   and ​ (c)   . Trace gases, including ​ (d)   are last.

​ ​ ​

• nitrogen
• argon
• oxygen
• carbon dioxide
• ozone
• nitrous oxide
• water vapor
• methane

Why is it harder to breathe at higher altitudes?

• Higher pressure

• Mountains are scary

• Lower density of oxygen molecules in the air

The pie chart represents the composition of Earth's atmosphere. Fill in the diagram with the appropriate gases for the blue and pink sections.

a

b

Oxygen

Nitrogen

Which gas makes up MOST of Earth's atmosphere?

• Nitrogen

• Oxygen

• Carbon Dioxiden

• Argon

Which gas is the second most abundant in the Earth's atmosphere?

• Oxygen

• Nitrogen

• Carbon Dioxide

• Argon

Which gas is not considered a major component of the Earth's atmosphere but is crucial for the greenhouse effect?

• Oxygen

• Nitrogen

• Carbon Dioxide

• Argon

What is the main function of the ozone layer?

• To provide oxygen for breathing

• To protect Earth from solar ultraviolet radiation

• To trap heat and keep the Earth warm

• To produce weather phenomena

What causes the auroras, which are typically seen in the polar regions?

• Chemical reactions in the troposphere

• Ozone layer depletion in the stratosphere

• Solar winds interacting with the thermosphere

• Meteor showers in the mesosphere

What is the effect of high concentrations of chlorofluorocarbons (CFCs) in the atmosphere?

• Increase in oxygen levels

• Depletion of the ozone layer

• Reduction in carbon dioxide levels

• Increase in nitrogen levels